198_Physics ProblemsTechnical Physics

198_Physics ProblemsTechnical Physics - 200 P7.30 Energy...

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200 Energy and Energy Transfer P7.30 (a) v f = × 0 096 3 10 2 88 10 87 .. ms ej Km v ff ==× × = × −− 1 2 1 2 9 11 10 2 88 10 3 78 10 23 1 7 2 16 . kg m s J (b) KWK if += :0 Fr K f cos θ F 0 028 0 3 78 10 16 .c o s . m J af °= × F 135 10 14 . N (c) Fm a = ; a F m == × × + 911 10 148 10 14 31 16 . . . N kg 2 (d) vva t xf xi x =+ 288 10 0 71 6 ×= + × 2 t t 194 10 9 s Check: xx vv t f i xi xf + 1 2 di 0028 0 1 2 0 2 88 10 7 m s + × t t 9 s Section 7.7 Situations Involving Kinetic Friction P7.31 a yy = : n −= 392 0 N n fn kk = = 392 0 300 392 118 N N N µ . a f (a) WF r F ° = cos . cos 130 5 00 0 650 a f J (b) ∆∆ Ef x k int J = 118 5 00 588 a fa f . (c) Wn r n ° = cos . cos 392 5 00 90 0 a f FIG. P7.31
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